AT&T has sent email messages to iPhone customers to remind users that international data usage is not covered under your existing U.S. data plan.

Your iPhone provides access to email, Visual Voicemail, Web browsing and other applications that can use a significant amount of data. It’s no surprise that you might find yourself using more data than you thought. AT&T wants to let you know of some easy ways to help minimize data usage charges when traveling overseas.

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